package ivan.cheng.tuqu.view;

import ivan.cheng.tuqu.util.BitmapUtil;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BlurMaskFilter;
import android.graphics.Canvas;
import android.graphics.EmbossMaskFilter;
import android.graphics.MaskFilter;
import android.graphics.Paint;
import android.graphics.Path;
import android.view.MotionEvent;
import android.view.View;



public class ScrawlView extends View {
    
   // private static final float MINP = 0.25f;
   // private static final float MAXP = 0.75f;
	private float mX, mY;
	private int mType = 0;
    private static final float TOUCH_TOLERANCE = 4;
    private Bitmap  mBitmap;
    private Canvas  mCanvas;
    private Path    mPath;
    private Paint   mBitmapPaint;
    
    private Paint       mPaint;
    private MaskFilter  mEmboss;
    private MaskFilter  mBlur;
    public ScrawlView(Context c) {
        super(c);
        
        mPath = new Path();
        mBitmapPaint = new Paint(Paint.DITHER_FLAG);
        mPaint = new Paint();
        mPaint.setAntiAlias(true);
        mPaint.setDither(true);
        mPaint.setColor(0xFF66CCFF);
        mPaint.setStyle(Paint.Style.STROKE);
        mPaint.setStrokeJoin(Paint.Join.ROUND);
        mPaint.setStrokeCap(Paint.Cap.ROUND);
        mPaint.setStrokeWidth(12);
        
        mEmboss = new EmbossMaskFilter(new float[] { 1, 1, 1 },
                                       0.4f, 6, 3.5f);

        mBlur = new BlurMaskFilter(8, BlurMaskFilter.Blur.NORMAL);
    }
    
    public boolean init(int iWidth, int iHeight)
    {
    	if(mBitmap != null && !mBitmap.isRecycled())
    		mBitmap.recycle();
    	 mBitmap = BitmapUtil.instance().createBitmap(iWidth, iHeight, Bitmap.Config.ARGB_8888);
         if(null == mBitmap)
        	 return false;
         mCanvas = new Canvas(mBitmap);
         return true;
    }
    
    @Override
    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        super.onSizeChanged(w, h, oldw, oldh);
    }
    
    @Override
    protected void onDraw(Canvas canvas) {
       // canvas.drawColor(0xFFAAAAAA);
        
        canvas.drawBitmap(mBitmap, 0, 0, mBitmapPaint);
        
        canvas.drawPath(mPath, mPaint);
    }
    
    private void touch_start(float x, float y) {
        mPath.reset();
        mPath.moveTo(x, y);
        mX = x;
        mY = y;
    }
    private void touch_move(float x, float y) {
        float dx = Math.abs(x - mX);
        float dy = Math.abs(y - mY);
        if (dx >= TOUCH_TOLERANCE || dy >= TOUCH_TOLERANCE) {
            mPath.quadTo(mX, mY, (x + mX)/2, (y + mY)/2);
            mX = x;
            mY = y;
        }
    }
    private void touch_up() {
        mPath.lineTo(mX, mY);
        // commit the path to our offscreen
        mCanvas.drawPath(mPath, mPaint);
        // kill this so we don't double draw
        mPath.reset();
    }
    
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        float x = event.getX();
        float y = event.getY();
        
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                touch_start(x, y);
                invalidate();
                break;
            case MotionEvent.ACTION_MOVE:
                touch_move(x, y);
                if(this.mType == 3)
                {//橡皮擦的话要立即生效
                	 touch_up();
                     touch_start(x, y);
                }
                invalidate();
                break;
            case MotionEvent.ACTION_UP:
                touch_up();
                invalidate();
                break;
        }
        return true;
    }
    
    public Paint getPaint()
    {
    	return mPaint;
    }
    public MaskFilter getEmboss()
    {
    	return mEmboss;
    }
    public MaskFilter getBlur()
    {
    	return mBlur;
    }
    
    public Bitmap GetBitmap()
    {
    	//save all clip   
    	//mCanvas.save(Canvas.ALL_SAVE_FLAG);//保存   
		
		//store   
    	//mCanvas.restore();//存储   
    	return mBitmap;
    }

	public void setType(int type) 
	{
		this.mType = type;
	}
}